package com.yitiao.demo100;

/**
 * 计算 1 + 1/2! + 1/3! + 1/4! +  + 1/20! 的值
 */
public class question_06 {
    public static void main(String args[]) {
        double sum=0,a=1;
        int i=1;
        while(i<=20) {
            sum=sum+a;
            i=i+1;
            a=a*(1.0/i);
        }
        System.out.println("sum="+sum);
    }
}
